[Bug 1696929] Re: Touchpads are unresponsive and laggy

[Daniel van Vugt]

Timo,

Any chance we could patch this for bionic only? No need to wait for
libinput release 1.10. Just take the fixes that are in the master branch
already and backport.

That would avoid clashing with James using Debian. Actually in general I
think many more people will need the fix than the status quo. It would
be very bad if the LTS went out without this fixed. A dramatic step
backwards for lots of people. And many of them won't know it's coming
until they do their LTS upgrade.

In my mind this libinput fix is more important than just about
everything else graphical and interactive because without it, the
desktop is just too frustrating to use. And worse, the primary
workaround for this bug is to revert to Xorg+synaptics, so we also lose
the dream of being able to stay in Wayland.

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https://bugs.launchpad.net/bugs/1696929

Title:
  Touchpads are unresponsive and laggy

Status in libinput:
  Fix Released
Status in libinput package in Ubuntu:
  Triaged
Status in libinput source package in Bionic:
  Triaged

Bug description:
  Some laptop touchpads are annoyingly unresponsive when the software
  implements any kind of hysteresis. This includes Lenovo X1 Carbon gen
  4 and 5. Such devices have lower precision and higher lag in the
  touchpad hardware than you might expect, so need the software to not
  slow them down further.

  The problem now is that using libinput by default slows down all
  touchpads and makes them less precise. For hardware that was already
  unresponsive, introducing software that further reduces the
  responsiveness is very frustrating, borderline unusable.

  When we were using Xorg the simple solution was to adjust hysteresis
  with 'synclient'. However now we're using Wayland we're stuck with
  libinput and I don't know how to fix it any more. Even Xorg logins
  seem to use libinput now, so there's no 'synclient' workaround
  available there anymore either.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: libinput10 1.6.3-1ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
  Uname: Linux 4.10.0-22-generic x86_64
  ApportVersion: 2.20.5-0ubuntu4
  Architecture: amd64
  Date: Fri Jun  9 14:52:18 2017
  InstallationDate: Installed on 2017-06-08 (0 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170607)
  SourcePackage: libinput
  UpgradeStatus: No upgrade log present (probably fresh install)

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